Spring handle fob drills



Fb. 3, 1931. M. o. KNiJTSON 1,791,061

SPRING HANDLE FOR. DRILLS Filed Aug. 23, 1927 INVENTOR.

A BY I Patented Feb. 3, 1931 UNITED STATES w en PATENT jj time I MARTIN o. xnnrson, or sourn ronoorinn onranro, CANADA, nssrenoa o CHICAGO PNEUMATIC TOGL COIVITPAN Y, NEW JERSEY OF NEW YORK, N". Y., A CORPORATION OF srnins HANDLE ron DRILLS Application filed August 2 This invention relates to manual supports for fluid pressure percussive tools commonly known as rock drills. It particularly relates to rock drills arranged and intended for shell mounting, and having wings or transversely extending flanges and a feed nut projection either integral with the drill cyl- V inder or provided on a cradle secured to the be applied to a. drill of the described type to adapt the same for use as a hand supported tool. Another object is to provide for the quick and easy attachment of the handle without the removal of any of the parts of the drill itsel'l. Another object isto provide an improved resilient handle attachment which is simple and sturdy, not liable to breakage, and easily repaired. Other ob- 5 jects will be apparent fromthedetailed description which follows.

In order to illustratethe invention one concrete embodiment thereof is shownin the accompanying drawings in which:

Fig. 1 is a top plan view of a drill with a handle attachment applied thereto;

Fig. 2 is a side elevational view of the drill shown in Fig. 1, but indicating the feed nut projection of the drill and the handle attachment in section substantially on the line 22 of Fig. 1, the guide member of the handle attachment being shown in elevation Figs. 3 and d are transverse sectional views substantially on the line at, 34, 3 of Fig. 2, the views being taken from the same point but looking in opposite directions.

The embodiment of the invention chosen for the purpose of illustration is disclose? as applied to a rock drill A of the cradle or shell mounted type having wing portions or projecting flanges a and feed nut projection .6. Since the drill itself forms no part of the present invention further description thereof is omitted.

The handle attachment includes side mems, 1927. Serial Ho. 2, 14,837.

bers, 5 and 6 having longitudinal recesses 5a and 6a slidably toreceive wing'projections a of the drill; At one end side members 5 and 6 are slightly upturned (Figs. 2 and 41) and are provided with aligned perforations not'shown) through which extends a trans verse member which may take the form of a bolt 7. Upon bolt 7 are mountedgrip portions 8 to adapt the same for use as a handle,

one of the grip portions beingdisposed betweenside members 5 and 6 and serving to properly space the same, A second transverse member 9'is removably secured toside members 5 and 6 by suitable means, such as stud bolts So, at a point remote from handle bolt 7. As clearly shown in Figs. 2, 3 and 4, bolt 7 and transverse member 9 are disposed in the plane offeednut projection 72 of the drill. Loosely mounted on these twotrans- Verse members and in substantial parallelism with side members 5 and 6 is a guide member 10 arranged to extend through the bore of feed nut projection 12. By preference the.

guide member is tubular and provided with notched ends 10aand 10b to fit the central handle grip 8 and transverse member 9 respectively, the guide member being clamped between the transverse members as shown in Fig. 2 when the attachment .is mounted upon a drill. Guide member 10 supports resilient means such as springs 11 and 12 yieldingly to resist movement of the handle attachment relative to the drill and to relieve the operator of the shocks and vibration due to the operation of the drill. As shown these springs are disposed upon guide member 10 on opposite sides of feed nut'projection b. In using the drill as a manually supported tool the operatorpresses down upon the grip handle to hold the drill to the work so that spring 11 which bears against the handle absorbs most of the shocks. "For this reason spring 12 is optional but its use is desirable to relieve the operator of shock when he hits the drill from the hole or carries it to a new location.

In applying the handle attachment the drill is removed from its shell. The handle is so disposed that recesses 5a, 6a are in line with wing portions a of the drill, whereupon the frame of the handle attachment is slid toward feed nut projection 12. Guide member 10 is passed through the bore of feed nut projection b and through spring 11 until its end 1065 contacts the central grip 8 of the handle. Spring 12 is then applied to the opposite end of guide member 10 and the second transverse member 9 is moved into place to cooperate with notch 10b in guide member 10. Member 9 is secured in place by the insertion of stud bolts 9a. The drill is then ready for use as a hand mounted tool.

The handle attachment is removed by reversing the above steps.

i Vhile a preferred form ofthe invention has been herein shown and described, 1t 15 to be understood that the invention 18 not limited to the specific details thereof, but covers all changes, modifications and adaptations within the scope of the appended claims.

I claim as my invention:

1. The combination with a drill of the cradle orshell mounted type of a handle attachment therefor in the form of a rectangular frame comprising side and transverse members, the side members having recesses slidably to receive the wing portions of the drill, the transverse members being disposed on opposite sides of the feed nut projection, a guide member loosely mounted on said transverse members and extending through the bore of the feed nut projection of the drill, and means on said guide member for yieldingly resisting movement of said handle attachment relative to the drill.

2. The combination with a drill of the cradle or shell mounted type of a handle attachment therefor in the rorm of a rectangular frame comprising side and transverse members, the side members having recesses slidably to receive the wing portions of the drill, the transverse members being disposed on opposite sides of the feed nut projection, a tubular guide member notched at its ends loosely to engage said transverse members and extending through the bore of the feed nut projection on the drill, and means on said guide member for yieldingly resisting movement of said handle attachment relative to the drill.

3. The combination with a drill of the cradle or shell mounted type of a handle attachment therefor comprising side members having recesses slidably to receive the wing portions of the drill, said members having upturned perforated ends, a bolt extending transversely through the perforations in said members and having grip portions to provide a handle and to maintain said members in proper spaced relation relative to each other, a second transverse member re- Tmovably secured to said side members at a point remote from said handle, said handle and said second transverse member being disposed in the plane of the feed nut projection of the drill and on opposite sides thereof, a guide member disposed in substantial parallelism with said side members and clamped between said transverse member and handle, said guide member extending through the bore of the feed nut projection of the drill, and resilient means on said guide member on opposite sides of the drill projection.

4. A handle attachment for drills of'the cradle or shell mounted type comprising side members having longitudinal recesses slidably to receive the Wing portions of a drill, transverse members for maintaining said side members in proper spaced relation, one of said transverse members being conveniently removable, a guide member arranged to be mounted between said transverse members and to extend through the bore of the feed and projection of the drill, and resilient means carried by said guide member for engagement between the drill projection and one of said transverse members.

5. A handle attachment for drills of the cradle or shell mounted type comprising side members having longitudinal recesses slidably to receive the wing portions of a drill, transverse members for maintaining said side members in proper spaced relation, one of said transverse members being conveniently removable and the other having grip portions to serve as a handle, a tubular guide member having notched ends to be loosely clamped between said transverse members in substantial parallelism with said side members and to extend through the bore of the feed nut projection of the drill, and coil springs on said guide member to engage opposite sides of the drill projection and the transverse members respectively.

Signed by'me at North Bay, Ontario, Canada, this 11th day of August, 1927.

MARTIN O. KNUTSON. 

